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160 ISO Film Question

Discussion in 'Film Forum' started by Marco, Jun 30, 2007.

  1. Marco


    Sep 25, 2006
    Washington D.C.
    Never thought of questioning this. Why is there a 160 ISO film speed? Would that be just as close to 100 or 200?

  2. The chemist

    The chemist

    Jul 22, 2005
    To the best of my understanding it has always been a nice speed for portraits.
  3. in the beginning, 160 asa was for Tungston lights, and therefore was given more sensitivity but kept as slow as possible for less grain, a compromise if you will - later, it was just another available speed, and yes, great fr portraits.....if you want to have some fun, shoot some 160T outside around water (water in the photo) and you will gret some fantastic colorations with pinks and blues and natural all mixed together.....just another fun point with breaking film rules...
  4. Ditto,

    I have 7 rolls of 160T 120 film (expired). You want them? PM me your address if you think you could use it!
    Gift, of course.
  5. Chris101


    Feb 2, 2005
    Cause it's faster than 100, so you can use a higher shutter, but not as grainy as 200. You don't see a lot of 200 speed film anymore either. Like everything else in photography, it's a compromise between one desired effect and another.
  6. Marco


    Sep 25, 2006
    Washington D.C.
    Thanks for the info! Ditto, thanks for the tip to try it around water.
  7. I've shot a bit of FP4+ (Ilford rate it at 125ISO) it's surprising how often that little bit of extra speeds gives you hand holdable shutter speed shooting on the meter.

    (A bit academic, given the exposure latitude of b&w, but nice to have anyway).
  8. Well ASA and ISO (and DIN come to that) film speeds standardised on a one third stop sequence about 50 years ago. Here it is with some of the films I can remember at different speeds

    10 The original Kodachrome
    25 Kodachrome 25 and some ultra fine grain B&W
    50 Agfacolour CT18 (18 was the DIN equivalent of 50 ASA/ISO)
    64 Ektachrome
    100 Kodacolor
    125 Ilford FP4, High Speed Ektachrome
    160 Tungsten Light Ektachrome
    200 Kodacolor 200
    400 Ilford HP4, Ilford HP5, Tri-X
    800 Ilford HPS (I think, this may have been the pushed speed).
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